接枝聚丙烯电容薄膜的高温储能特性  

High Temperature Energy Storage Characteristics of Grafted Polypropylene Capacitor Film

作　　者：罗兵 李君洛 王少杰 胡世勋 徐永生 肖微 徐刚毅 何金良[2] 李琦[2] LUO Bing;LI Junluo;WANG Shaojie;HU Shixun;XU Yongsheng;XIAO Wei;XU Gangyi;HE Jinliang;LI Qi(National Engineering Research Center of UHV Technology and New Electrical Equipment,Guangzhou 510080,Guangdong Province,China;State Key Laboratory of Power System and Generation Equipment(Department of Electrical Engineering,Tsinghua University),Haidian District,Beijing 100084,China)

机构地区：[1]特高压电力技术与新型电工装备基础国家工程研究中心,广东省广州市510080 [2]电力系统及大型发电设备安全控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2024年第9期3371-3377,I0002,共8页Proceedings of the CSEE

基　　金：特高压工程技术(昆明、广州)国家工程实验室开放基金(NELUHV-2021-KF-03)。

摘　　要：随着海上风电、电动汽车和油气勘探的迅速发展,对薄膜电容器的工作温度提出更高的要求。然而,当环境温度达到120℃时,目前使用最为广泛的双向拉伸聚丙烯电容薄膜充放电效率急剧下降,不能满足应用需求。该文制备了苯乙烯接枝聚丙烯(PP-g-St)双向拉伸电介质薄膜,在120℃下,PP-g-St可以将能量密度从0.23 J/cm^(3)提高到1.67 J/cm^(3)(储能效率在90%以上),同时接枝后击穿场强大幅提升,高温泄漏电流得到有效抑制,这源自于接枝后引入的深陷阱限制了载流子的输运。接枝样品中的自聚相经拉伸后与基体具有良好的相容性。该文研究为适用于高温高场条件的聚丙烯基电容器薄膜材料的大规模制备提供可能。With the rapid development of offshore wind power,electric drive vehicle and oil and gas exploration,film capacitors are required to operate at higher temperature.However,when the temperature reaches 120℃,the chargedischarge efficiency of the most widely used biaxially oriented polypropylene(BOPP)decreases sharply,which fails to meet the demand of applications.In this paper,biaxially oriented dielectric films of styrene-grafted polypropylene(PP-g-St)are prepared.It is found that the energy density of PP-g-St is increased from 0.23 J/cm^(3) to 1.67 J/cm^(3)(grafting efficiency is 90%)at 120℃.At the same time,the breakdown field is greatly enhanced and the high temperature leakage current is effectively suppressed,which can contribute to the deep traps introduced by grafting significantly hindering the charge transportation.After stretching,the self-polymerized phase has good compatibility with the polypropylene matrix.This study provides a potential technical route for large-scale production of polypropylene-based capacitor materials for high temperature and high field applications.

关 键 词：接枝聚丙烯 双向拉伸薄膜 薄膜电容器 高温 介电储能 

分 类 号：TM53[电气工程—电器]